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Reports fields that are declared without any access modifier (also known as package-private).
<p>Constants (that is, fields marked <code>static</code> and <code>final</code>) are not reported.</p>
<p><b>Example:</b></p>
<pre><code>
  public class A {
    Object object;             // warning
    final static int MODE = 0; // constant, no warning
  }
</code></pre>
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